Power-hammer



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F. G. BROOKSBANK.

POWER HAMMER.

N0. 485,168. Patented Nov. 1, 1892.

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F. G. BROOKSBANK.

POWER HAMMER.

No. 485,168. Patented Nov. 1, 1892.

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POWER HAMMER.

No. 485,168. Patented Nov. 1, 1892.

- N NT R hmfiaww UNITE STATES PATENT OFFICE.

FREDERICK CLEMENT BROOKSBANK, OF CLEVELAND, OHIO.

POWER-HAMMER.

SPECIFICATION forming part of Letters Patent No. 485,168, dated.November 1, 1892. Application filed September 30, 1891- Serial No.407,282. (No model.)

To all whom, it may concern.-

Be it known that I, FREDERICK CLEMENT BROOKSBANK, a citizen of theUnited States, residing at Cleveland, in the county of Guyahoga andState of Ohio, have invented certain new and useful Improvements inPower-Hammers, of which the following is such a full, clear, and exactdescription as will enable others skilled in the art to which itappertains to practice the same.

The primary invention herein described and claimed is applicable both tosteam-hammers and pneumatic hammers. It has heretofore been impossibleto do any considerable variety of work with such hammers withoutchanging the dies on both the hammer-head and the anvil, because aneffective blow could with safety be delivered only at a point beneath orsubstantially beneath the pistonrod. If the article to be struck beinterposed between the anvil and the hammer head much to one side of thepoint at which the piston-rod is connected therewith, there is a strongtendency to bend or break said rod, and by far the greatest item ofexpense in keeping this style of hammers in repair is for replacing bentand broken piston-rods.

It is the object of my invention to provide a construction in this styleof hammers,whereby a wide hammer-head may be employed in which a greaternumber of gates or dies may be formed and used than with the known formsof this class of hammers without serious danger to the device.

To this end it consists in the construction and combination of theparts, herein described, and pointed out definitely in the claims.

The invention is shown embodied in apneumatic hammer of that class whichis shown in Letters Patent No. 394,483 and No. 394,484, granted December11, 1888, to Jacob B. Perkins and myself as assignees of GilbertGlossop.

In the drawings, Figure 1 is a side elevation of a pneumatic hammercontaining my invention. Fig. 2 is a front elevation of the same. Fig. 3is a vertical sectional view through both cylinders. Fig. 4 is atransverse sectional view on line 4 4 of Fig. 3.

I will now proceed to describe in detail the embodiment of my inventionwhich the drawings show, calling attention to the fact that I do notintend to limit my invention to this specific form further thanindicated by the claims.

Referring to the parts by letters, A A represent the sides of thehammer-frame.

B B represent parallel cylinders rigidly connected together. Thesecylinders are guided in a vertical path by suitable guides in the sideframe, and they are suitably connected with a crank-shaft F, wherebythey are simultaneously moved up and down in a vertical path. Theinteriors of these cylinders oommunicate with each other through openports I) b, one in each end thereof. Each of the cylinders contains apiston C, which is connected by a piston-rod D with the hammerhead E,which is also guided in its vertical movement by its engagement with theframe A A. When the cylinders are being moved rapidly up and downthrough their connection with the crank-shaft, the pistons are given thevertical reciprocating movement well known in this class of hammers. Byreason of the open ports connecting the tops and bottoms of these twincylinders the density of the air compressed in the upper part of eachwill be the same, and therefore the pistons will move upward to exactlythe same extent, and for the same reason they will move downward toexactly the same extent. It is obvious that with this construction awider hammer-head may be employed than in a device where only onepiston-rod is employed. A blow struck by the ham mer-head beneath thepoint of attachment of either piston or between these points will havelittle effect in bending or breaking the piston-rods, because eachpiston-rod acts as a brace to the other. There is therefore a distinctgain in strikingsurface, equal practically to the distance between thetwo rods.

With a view of simplifying and cheapening the construction of theabove-described device both cylinders are formed in one piece of metal.The necessary inlet-ports H H in their upper ends converge and meet in asingle port g in that part of the metal connecting the two cylinders,and a single checkvalve controls this port and consequently the amountof air admitted to both cylinders.

The inlet-ports in the lower ends of the 03 1- I inders similarlyconverge and meet in a single inlet-port g, having a check-valve, whichin like manner controls the amount of air admitted in the lower ends ofboth cylinders.

The outlet-ports I I in both cylinders converge and unite to form asingle outlet-port K. A valve L of well-known construction is providedfor closing this port, and the pressure-piece M of any well-knownconstruction is provided for operating this valve in the ordinarymanner. If more than one outletport be employed for each cylinder, theywill in like manner unite to form a single port, which may be controlledby a single valve. There is nothingnovel in the manner in which theoutlet-ports are arranged with reference to the length of the cylindersor in the manner in which their valves are controlled. The arrangementand method of operating said valves which are shown in the drawings formbut one of several which are well known.

Having thus described my invention, what. I claim as new, and desire tosecure by Letters Patent, is

1. The combination of two parallel cylinders having open portsconnecting them at both I with the hammer-head, substantially as and forthe purpose specified.

2. The combination, in a pneumatic ha mmer, of two rigidly-connectedparallel cylinders having open ports connecting them at both ends, meansfor imparting to said cylinders a reciprocating movement, a pistonmovable in each cylinder, a hammer-head, and a piston-rod connectingeach piston with said hammer-head, substantially as and for the purposespecified.

3. The combination, in a pneumatic hammer, of two rigidly-connectedparallel cylinders having open ports connecting them at both ends andhaving each an inlet-port in its upper end, which unite to form a singleport, a check-valve for closing said port, an inlet-port in the lowerend of each cylinder, which ports unite to form a single port, acheck-valve for closing said port, a su table outlet-port in eachcylinder, which unite'to form a single port, andasuit-able valve wherebysaid port may be opened and closed by mechanism outside of saidcylinders, substantially as and for the purpose specified.

FREDERICK CLEMENT BRQOKSBANK.

Witnesses:

M. S. INGHAM, FRANK. MILLER.

